Inquery about the datasource of the files used in test data folder

[YouQam]

[YouQam]

Dear maintainers of the repository,
I hope you are doing well. I am working with o2r team and I wanted to use some of the files in your testdata folder.
It would be nice if you can send me the data-source of the files.

Yousef

[nuest]

@carobro @JaFro96 @hilal98 @yhallowiegeht @corneliazy It would be very helpful if you could check your notes, or try to remember, where you found the test files used in this repository. We'd like to make sure that there are no problems with the licenses of those files.

You can find a full list of the files we use at https://github.com/YouQam/geoextent/blob/master/tests/Testdata/data-sources.md